mirror of
https://github.com/thegeeklab/ansible-later.git
synced 2024-11-18 02:40:40 +00:00
345 lines
11 KiB
Python
345 lines
11 KiB
Python
"""Package with general repository related functions"""
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import os
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import stat
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from string import digits
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from git.compat import xrange
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from git.exc import WorkTreeRepositoryUnsupported
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from git.objects import Object
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from git.refs import SymbolicReference
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from git.util import hex_to_bin, bin_to_hex, decygpath
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from gitdb.exc import (
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BadObject,
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BadName,
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)
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import os.path as osp
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from git.cmd import Git
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__all__ = ('rev_parse', 'is_git_dir', 'touch', 'find_submodule_git_dir', 'name_to_object', 'short_to_long', 'deref_tag',
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'to_commit', 'find_worktree_git_dir')
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def touch(filename):
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with open(filename, "ab"):
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pass
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return filename
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def is_git_dir(d):
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""" This is taken from the git setup.c:is_git_directory
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function.
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@throws WorkTreeRepositoryUnsupported if it sees a worktree directory. It's quite hacky to do that here,
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but at least clearly indicates that we don't support it.
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There is the unlikely danger to throw if we see directories which just look like a worktree dir,
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but are none."""
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if osp.isdir(d):
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if osp.isdir(osp.join(d, 'objects')) and osp.isdir(osp.join(d, 'refs')):
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headref = osp.join(d, 'HEAD')
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return osp.isfile(headref) or \
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(osp.islink(headref) and
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os.readlink(headref).startswith('refs'))
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elif (osp.isfile(osp.join(d, 'gitdir')) and
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osp.isfile(osp.join(d, 'commondir')) and
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osp.isfile(osp.join(d, 'gitfile'))):
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raise WorkTreeRepositoryUnsupported(d)
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return False
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def find_worktree_git_dir(dotgit):
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"""Search for a gitdir for this worktree."""
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try:
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statbuf = os.stat(dotgit)
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except OSError:
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return None
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if not stat.S_ISREG(statbuf.st_mode):
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return None
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try:
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lines = open(dotgit, 'r').readlines()
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for key, value in [line.strip().split(': ') for line in lines]:
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if key == 'gitdir':
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return value
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except ValueError:
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pass
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return None
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def find_submodule_git_dir(d):
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"""Search for a submodule repo."""
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if is_git_dir(d):
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return d
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try:
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with open(d) as fp:
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content = fp.read().rstrip()
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except (IOError, OSError):
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# it's probably not a file
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pass
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else:
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if content.startswith('gitdir: '):
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path = content[8:]
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if Git.is_cygwin():
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## Cygwin creates submodules prefixed with `/cygdrive/...` suffixes.
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path = decygpath(path)
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if not osp.isabs(path):
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path = osp.join(osp.dirname(d), path)
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return find_submodule_git_dir(path)
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# end handle exception
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return None
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def short_to_long(odb, hexsha):
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""":return: long hexadecimal sha1 from the given less-than-40 byte hexsha
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or None if no candidate could be found.
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:param hexsha: hexsha with less than 40 byte"""
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try:
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return bin_to_hex(odb.partial_to_complete_sha_hex(hexsha))
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except BadObject:
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return None
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# END exception handling
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def name_to_object(repo, name, return_ref=False):
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"""
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:return: object specified by the given name, hexshas ( short and long )
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as well as references are supported
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:param return_ref: if name specifies a reference, we will return the reference
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instead of the object. Otherwise it will raise BadObject or BadName
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"""
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hexsha = None
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# is it a hexsha ? Try the most common ones, which is 7 to 40
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if repo.re_hexsha_shortened.match(name):
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if len(name) != 40:
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# find long sha for short sha
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hexsha = short_to_long(repo.odb, name)
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else:
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hexsha = name
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# END handle short shas
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# END find sha if it matches
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# if we couldn't find an object for what seemed to be a short hexsha
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# try to find it as reference anyway, it could be named 'aaa' for instance
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if hexsha is None:
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for base in ('%s', 'refs/%s', 'refs/tags/%s', 'refs/heads/%s', 'refs/remotes/%s', 'refs/remotes/%s/HEAD'):
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try:
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hexsha = SymbolicReference.dereference_recursive(repo, base % name)
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if return_ref:
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return SymbolicReference(repo, base % name)
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# END handle symbolic ref
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break
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except ValueError:
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pass
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# END for each base
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# END handle hexsha
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# didn't find any ref, this is an error
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if return_ref:
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raise BadObject("Couldn't find reference named %r" % name)
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# END handle return ref
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# tried everything ? fail
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if hexsha is None:
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raise BadName(name)
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# END assert hexsha was found
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return Object.new_from_sha(repo, hex_to_bin(hexsha))
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def deref_tag(tag):
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"""Recursively dereference a tag and return the resulting object"""
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while True:
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try:
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tag = tag.object
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except AttributeError:
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break
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# END dereference tag
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return tag
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def to_commit(obj):
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"""Convert the given object to a commit if possible and return it"""
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if obj.type == 'tag':
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obj = deref_tag(obj)
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if obj.type != "commit":
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raise ValueError("Cannot convert object %r to type commit" % obj)
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# END verify type
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return obj
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def rev_parse(repo, rev):
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"""
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:return: Object at the given revision, either Commit, Tag, Tree or Blob
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:param rev: git-rev-parse compatible revision specification as string, please see
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http://www.kernel.org/pub/software/scm/git/docs/git-rev-parse.html
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for details
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:raise BadObject: if the given revision could not be found
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:raise ValueError: If rev couldn't be parsed
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:raise IndexError: If invalid reflog index is specified"""
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# colon search mode ?
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if rev.startswith(':/'):
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# colon search mode
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raise NotImplementedError("commit by message search ( regex )")
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# END handle search
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obj = None
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ref = None
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output_type = "commit"
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start = 0
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parsed_to = 0
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lr = len(rev)
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while start < lr:
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if rev[start] not in "^~:@":
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start += 1
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continue
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# END handle start
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token = rev[start]
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if obj is None:
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# token is a rev name
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if start == 0:
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ref = repo.head.ref
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else:
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if token == '@':
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ref = name_to_object(repo, rev[:start], return_ref=True)
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else:
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obj = name_to_object(repo, rev[:start])
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# END handle token
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# END handle refname
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if ref is not None:
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obj = ref.commit
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# END handle ref
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# END initialize obj on first token
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start += 1
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# try to parse {type}
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if start < lr and rev[start] == '{':
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end = rev.find('}', start)
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if end == -1:
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raise ValueError("Missing closing brace to define type in %s" % rev)
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output_type = rev[start + 1:end] # exclude brace
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# handle type
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if output_type == 'commit':
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pass # default
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elif output_type == 'tree':
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try:
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obj = to_commit(obj).tree
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except (AttributeError, ValueError):
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pass # error raised later
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# END exception handling
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elif output_type in ('', 'blob'):
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if obj.type == 'tag':
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obj = deref_tag(obj)
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else:
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# cannot do anything for non-tags
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pass
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# END handle tag
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elif token == '@':
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# try single int
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assert ref is not None, "Requre Reference to access reflog"
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revlog_index = None
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try:
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# transform reversed index into the format of our revlog
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revlog_index = -(int(output_type) + 1)
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except ValueError:
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# TODO: Try to parse the other date options, using parse_date
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# maybe
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raise NotImplementedError("Support for additional @{...} modes not implemented")
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# END handle revlog index
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try:
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entry = ref.log_entry(revlog_index)
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except IndexError:
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raise IndexError("Invalid revlog index: %i" % revlog_index)
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# END handle index out of bound
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obj = Object.new_from_sha(repo, hex_to_bin(entry.newhexsha))
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# make it pass the following checks
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output_type = None
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else:
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raise ValueError("Invalid output type: %s ( in %s )" % (output_type, rev))
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# END handle output type
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# empty output types don't require any specific type, its just about dereferencing tags
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if output_type and obj.type != output_type:
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raise ValueError("Could not accommodate requested object type %r, got %s" % (output_type, obj.type))
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# END verify output type
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start = end + 1 # skip brace
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parsed_to = start
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continue
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# END parse type
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# try to parse a number
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num = 0
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if token != ":":
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found_digit = False
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while start < lr:
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if rev[start] in digits:
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num = num * 10 + int(rev[start])
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start += 1
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found_digit = True
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else:
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break
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# END handle number
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# END number parse loop
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# no explicit number given, 1 is the default
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# It could be 0 though
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if not found_digit:
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num = 1
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# END set default num
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# END number parsing only if non-blob mode
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parsed_to = start
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# handle hierarchy walk
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try:
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if token == "~":
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obj = to_commit(obj)
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for _ in xrange(num):
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obj = obj.parents[0]
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# END for each history item to walk
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elif token == "^":
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obj = to_commit(obj)
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# must be n'th parent
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if num:
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obj = obj.parents[num - 1]
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elif token == ":":
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if obj.type != "tree":
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obj = obj.tree
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# END get tree type
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obj = obj[rev[start:]]
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parsed_to = lr
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else:
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raise ValueError("Invalid token: %r" % token)
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# END end handle tag
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except (IndexError, AttributeError):
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raise BadName("Invalid revision spec '%s' - not enough parent commits to reach '%s%i'" % (rev, token, num))
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# END exception handling
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# END parse loop
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# still no obj ? Its probably a simple name
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if obj is None:
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obj = name_to_object(repo, rev)
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parsed_to = lr
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# END handle simple name
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if obj is None:
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raise ValueError("Revision specifier could not be parsed: %s" % rev)
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if parsed_to != lr:
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raise ValueError("Didn't consume complete rev spec %s, consumed part: %s" % (rev, rev[:parsed_to]))
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return obj
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